what is double side printed circuit board ?the FR4 material has 2 copper trace, and also named as "Double Sided PCB" (D/S ... us, you receive unparalleled technical expertise support for double side pcb manufacture or PCBA;we strive for our customers ... Projectors,Hard drives/video cards,Graphic production,Form buster,Label makers,Mailing equipment,Surveillance,Television,Vending machines,Voice recorder ...